Squealing noise

I have a 2007 Pontiac G6 hard top convertible; it makes a loud squealing noise when I accelerate. Stops when it down shifts. Could this be a belt issue?

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Tuesday, March 29th, 2011 AT 9:09 PM

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SATURNTECH9

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Yes could be the belt you could have a weak belt tensioner is the noise worse with the a/c on?

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Tuesday, March 29th, 2011 AT 9:34 PM

JKAMKE15

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I am not using air (live in Wisconsin). It happens when I accelerate and as soon as it backs down it stops. Leak in a hose?

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Tuesday, March 29th, 2011 AT 9:39 PM

SATURNTECH9

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Sound's like you could have a weak belt tensioner that's what keep's your drive belt tight. If you have a/c on your car an it work's turn it on and see if the noise gets worse.

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Tuesday, March 29th, 2011 AT 9:43 PM

T5825DB

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Monday, July 18th, 2011 AT 11:34 PM

X44+

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It seems to be known issue with resonator on the G6 HTCs. (G6performance. Com) Maybe because of the exhaust's size, anyway had the same problem, whistling noise under acceleration between 2000 - 3000 rpm but no other time. Checked belts, tensioners, etc, etc, no joy. No longer under warranty I had a Magnaflow 10424 put in and that fixed all the weird noise, just sounds good. Good luck!
-jon